Description

Lie face-up on the ground or bench with your hands reaching behind your head to grasp a secure base or bench, feet up, and thighs perpendicular to the ground - both your hips and knees should form a 90-degree angle. Slowly bring your knees toward your chest, lifting your hips and glutes off the ground or bench, and try to maintain the bend in your knees throughout the movement. Return to the start under control.

Tips

Note: You can make this harder by doing it on a decline bench with your head on the high end.